任意

• Reading: にんい
• Romaji: nin'i
• Kanji breakdown: 任 (nin/maka) — entrust, leave to; 意 (i) — intention, will, meaning
• Pronunciation: /ni.ɴ.i/

Meaning

Optional; voluntary; arbitrary; discretionary; at one's discretion.

A na-adjective and noun meaning 'at one's choosing' or 'optional.' Used across many fields: in law, 任意の取り調べ (voluntary questioning); in maths, 任意の点 (an arbitrary point); in forms, 任意項目 (optional field). Also appears in compound nouns: 任意保険 (optional/voluntary insurance). Formal and precise — preferred in official, technical, and academic contexts over more casual alternatives like 自由 (jiyū, free).

Examples

1. この項目は任意なので記入しなくても構いません。 This field is optional, so you don't have to fill it in.
2. 任意の数字を一つ選んでください。 Please pick any number you like.
3. 警察から任意で事情を聞かれた。 The police asked to question me on a voluntary basis.

Usage Guide

Context: legal, academic, forms and documents

Tone: neutral

Origin & History

From Sino-Japanese: 任 (nin, entrust/leave to) + 意 (i, intention/will). Together they form 'left to one's will' — something decided at the individual's own discretion rather than being mandatory.

Cultural Context

Era: Modern

Generation: Adults

Social background: Professional